Hoist control



F. E. STAHL HOIST CONTROL Feb. 24, 1942.

Filed Dec. 23, 1938 Patented Feb.24, 1942 2,273,907

UNITED STATES PATENT OFFICE HOIST CONTROL Frank E. Stahl, deceased, late of Tonawanda,

N. Y., by Lillie M. Stahl, administratrix, Tonawanda, N. Y., and Alfred Cotesworth, Kenmore, N. Y., assignors to Columbus McKinnon Chain Corporation, Tonawanda, N. Y., a corporation of New York Application December 23, 1938, Serial No. 247,373

5 Claims.

Our invention relates in general to hoist controls and particularly to the controls of the electric type hoist in which an electric motor forms lever I3 is provided with a hubl Ill, which hub is rotatably mounted upon the head Il of the control shaft. The lever is held against outward axial movement upon the head by means of a washer I 2. The Washer is secured in position against the head preferably by means of a bolt 34. The level` is held against inward axial. movement on said head by means of a collar 35 formed preferably on said head.

use of a motor of the single-phase, split-phase l The control lever of our device is provided with type, or the capacitor type. When such type of a control arm I arranged to lie in substantially motor is used, however, it is necessary that some a horizontal plane when the lever is in neutral means be provided for preventing too rapid opposition. yThis arm is attached to the hub I4 and eration of the controller switch in effecting a is positioned preferably at or below the axis oi reversal of the motor shaft since, unless the mol5 the hub, and substantially at or below the lower tor shaft is allowed to come to a standstill be periphery of the hub. It is centrally arranged fore the reverse switch is thrown to its operawith respect to the axis of the hub and is protive position, the motor shaft and armature will vided with a slot I6 of substantially arcuate or continue to rotate in the direction first opeiwide V-shape formation. This slot is bounded ated, preferably on the upper side by an arcuate sur- One of the principal objects of our invention face Il and on the bottom side by inclined surhas been, therefore, to provide a control for an faces I8 which meet and join each other subelectric hoist, equipped with such type motor, stantially at the center of the arm. At the exwhich will cause a delay in the operation of the treme outer ends of the arm the surfaces Il and controller switch from one direction of rotation IB are joined together by a circular surface I9. of the motor to the other direction, during which This surface is arranged to have its lower pedelay the motor shaft will have had time to riphery slightly below the inclined surface I8 come to a standstill. whereby a slight recess 20 is provided, to be Another object has been to provide a device hereinafter described. A trolley 2I is carried which may be easily applied to existing hoists by the control lever and a roller 22 is rotatably without the necessity of altering or redesigning supported thereby. The trolley is preferably of such hoist. U-shape formation, as shown in Fig. 3, and the Moreover, it has been an object to provide a roller is so mounted as to engage with the indevice of this nature which can be operated by a clined surfaces I3 and the recesses 20, Our insingle pull cord. vention contemplates the use of but one oper- Furthermore, our invention is inexpensive to ating cord 23 which is attached to the trolley 2| manufacture and does not, therefore, add maand carries at its lower end an operating handle terially to the cost of the entire hoist. 24.

The above objects and advantages have been The control lever I3 is mounted for a limited accomplished by the device shown in the acamount of free movement upon the head II of companying drawing, of which: the control shaft, and this is accomplished by Fig. 1 is a side elevation of a complete electric providing the hub I4 of the lever with an arcuate hoist equipped with our invention. groove 25, having its radii struck from the axis Fig. 2 is a fragmentary, end elevation of our u of the hub and providing abutment shoulders 2S improved device, 40 and 2'! at the ends thereof. A detent key 28 is Fig. 3 is a fragmentary, sectional, side elevacarried b-y the head II and projects into the slot tion thereof taken on line 3-3 of Fig. 2. 25, in which position it will be engageable with In the drawing, 5 represents the hoist which either the abutment shoulder 25 or 21, is provided with an electric motor 6 and a con- The control lever is preferably held in its neutroller switch 1. The casing of the hoist is reptral position by means of a centralizing spring resented at 8, to which the motor is attached. 29 which has its upwardly extending ends 30 The cover of the casing is represented at 9. engageable with a lug 3| carried by the cover or The control shaft I0 of our device is rotatably casing 9 of the hoist and a lug or pin 32 carried carried by the casing of the hoist and it is proby an upstanding arm 33 provided on the hub I4 vided with an enlarged vhead II. The control of the control lever.

When it is desired to operate a hoist equipped with our device, the handle 2l at the bottom of the operating cord 23 is grasped and the trolley 2l is moved through the groove I6 to either end of the arm I5 of the control lever. If, for instance, the load is to be elevated, the trolley will be moved to the right-hand end of the arm, as viewed in Fig. 2, and the roller thereof will drop into the recess when it reaches the end of the surface I8, whereupon the operator then pulls the cord downwardly which will cause this end of the arm to be depressed. During such movement, the lever is free to rotate idly upon the head II and the slot carried by the hub I4 of the lever will be moved around over the detent key 23 until the abutment shoulder 26 is reached. When this shoulder is brought in contact with the key 28, the head II and the control shaft I0 will be positively operated to cause the controller switch "I to be operated in the proper direction. When the hoist is now to be operated in the reverse direction, and the load is to be lowered, the operator releases his pull upon the operating cord 23, allowing the control lever to be returned to its neutral position by means of the centralizing spring 29, and the controller switch I to return to its neutral position under the tension of the centralizing spring usually provided with such switches (not shown). The roller 22 of the trolley 2I is then removed from the recess 20 by a slight side-wise jerking movement of the control cord to the left of Fig. 2, which will cause the roller 22 to be released from the recess and allow the trolley to ride down the inclined surface I8 at the right-hand side of the arm. The operator may now move the trolley toward the left (as viewed in Fig. 2), causing it to ride over the inclined surface I8 at the left-hand end of the control arm I5 until the roller 22 reaches the recess 20 in that end of the arm. During the return movement of the control arm to its neutral position, the slot 25 has moved idly over the key 28 and now, upon again pulling the cord 23, the left-hand end of the arm I5 of the control lever will be depressed, which will cause the slot 25 to ride over the detent key 28 until the abutment shoulder 2l has been reached, after which the head II and the control shaft ID will be positively operated in counterclockwise direction to operate the controller switch.

The time required to bring the control lever I3 back to its neutral position and to move the trolley through the groove I6 to the other extreme end of the arm, in addition to the lost motion between the abutment shoulders of the groove 25 and the detent key 28, will provide sufficient time for the motor of the hoist to come to a standstill before the controller switch can be operated to reverse the direction of rotation of the motor shaft. Obviously, instead of the inclined surfaces I8, the lower side of the groove I6 may be bounded by an arcuate or curved surface.

These and other modifications of the details herein shown and described may be made without departing from the spirit of our invention or the scope of the appended claims, and We do not, therefore, wish to be limited to the exact embodiment herein shown and described, the form shown being merely a preferred embodiment thereof.

Having thus described our invention, what We claim is:

1. A control for single-phase, reversing electric motors of the type which continues its operation uni-directionally upon too rapid operation of the reversing means, comprising a control member freely movable in two directions, a. manually actuated control lever oscillatably mounted substantially midway its length upon said control member, said control lever having outwardly and oppositely extending arms projecting one from each side thereof, each arm being formed with an operating surface, the surface of each arm meeting and joining the surface of the other arm, control means slidably mounted upon the operating surfaces of said control lever, and an operating rope connected to said control means.

2. A control for single-phase, reversing electric motors of the type which continues its operation uni-directionally upon too rapid operation of the reversing means, comprising a control member freely movable in two directions, a manually actuated control lever oscillatably mounted substantially midway its length upon said control member, said control lever having outwardly and oppositely extending arms projecting one from each side thereof, each arm being formed with an operating surface, the surface of each arm meeting and joining the surface of the other arm, each of said surfaces being formed with a recess at its opposite extremity, control means slidably mounted upon the operating surfaces of said control levers for alternate engagement with said recesses, and an operating rope connected to said control means.

3. A control for single-phase, reversing electric motors of the type which continues its operation uni-directionally upon too rapid operation of the reversing means, comprising a control shaft freely movable in two directions, a manually actuated control lever oscillatably mounted substantially midway its length upon said control shaft, said control lever having outwardly and oppositely extending arms projecting one from each side thereof, each arm being formed with an inclined operating surface, the surface of each arm being inclined in the opposite direction and meeting and joining the surface of the other arm, control means slidably mounted upon the operating surfaces of said control levers, and an operating rope connected to said control means.

4. A control for single-phase, reversing electric motors of the type which continues its operation uni-directionally upon too rapid operation of the reversing means, comprising a control member freely movable in two directions, a manually actuated control member oscillatably mounted substantially midway its length upon said control lever for idle relative movement therewith through a limited arcuate path in either direction to its actuating position, said control lever being adapted to be moved in either direction by means of a single operating rope, said control lever having outwardly and oppositely extending arms projecting one from each side thereof, each arm being formed with an in clined operating surface, the surface of each arm being inclined in the opposite direction and meeting and joining the surface of the other arm, control means connected to said operating rope and slidably mounted upon the operating surfaces of said control lever, and interspaced detent means carried by said control shaft and said control lever for coupling said shaft and said lever at the extremities of said idle relative movement to positively actuate said shaft to either actuating position.

5. A control for single-phase, reversing electric motors of the type which continues its operation uni-directionally upon too rapid operation of the reversing means, comprising a control member freely movable in two directions, a manually actuated control lever oscillatably mounted substantially midway its length upon said control member for idle relative movement therewith through a limited arcuate path in either direction to its actuating position, said control lever being adapted to be moved in either direction by means of a single operating rope, said control lever having outwardly and oppositely extending arms projecting one from each side thereof, each arm being formed with an inclined operating surface, the surface of each arm being inclined in the opposite direction and meeting and Joining the surface of the other arm, each of said surfaces being formed with a recess at its outer extremity, control means connected to said operating rope and slidably mounted upon the operating surfaces of said control lever and alternately engageable with said recesses, and interspaced detent means carried by said control shaft and said control lever for coupling said shaft and said lever at the extremities of said idle relative movement to positively actuate said shaft to either actuating position.

LILLIE M. STAHL, A Administratrix with the Will Annexed of Frank E. Stahl, Deceased.

l ALFRED COTESWORTH. 

